30305281 has 2 divisors, whose sum is σ = 30305282. Its totient is φ = 30305280.

The previous prime is 30305279. The next prime is 30305287. The reversal of 30305281 is 18250303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30305025 + 256 = 5505^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 30305281 - 2¹ = 30305279 is a prime.

It is a super-2 number, since 2×30305281² = 1836820112977922, which contains 22 as substring.

Together with 30305279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30305287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15152640 + 15152641.

It is an arithmetic number, because the mean of its divisors is an integer number (15152641).

Almost surely, 2^30305281 is an apocalyptic number.

It is an amenable number.

30305281 is a deficient number, since it is larger than the sum of its proper divisors (1).

30305281 is an equidigital number, since it uses as much as digits as its factorization.

30305281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 30305281 is about 5505.0232515404. The cubic root of 30305281 is about 311.7736722883.

Adding to 30305281 its reverse (18250303), we get a palindrome (48555584).

The spelling of 30305281 in words is "thirty million, three hundred five thousand, two hundred eighty-one".